Drill-chuck.



N. G. BERGLUND.'

y DRILL CHUCK. APPLlcATloN FlLED luLY 6.1911.

Patented May 7,1918.

NILS GUSTAF BERGLUND, 0F VEDEVG, SWEDEN.

DRILL-CHUCK.

Specification of Letters Patent.

` Patenten May t, reis.

Application filed July 6, 1917. Sera1No.'179,052.

To aZZ whom t may concern:

Be it known that l, NrLs Gusrar BERG- LUND, a subject of the King of Sweden, residing at Vedevg, in the Frovince of Vstmanland and Kingdom of Sweden, have invented a new and useful Drill-Chuck, of which the following is a specification.

|The present invention refers to such drillchucks for drills with conical fastening and which consist of a fixed and a loose part which, together, form an exteriorly cylindrical holder which is so arranged that the drill, by means of a simple manipulation, can be fastened in or released from the chuck while the drilling machine is in operation.

The improvement consists mainly in the fixed and the loose parts being held together by a hollow cylinder between which and the holder there is arranged a roller-bearing or a ball-bearing, and by the roller-path being provided with a slot in order that when the hollow cylinder is rotated in such a way that the said slot comes just opposite the loose part, this loose part may be able to move outward and thereby release the drill.

The present invention is also characterized by a loose part or catch to be placed in the conical aperture so that it will be possible to employ drills with `broken catchpms.

The invention is illustrated by the accompanying drawing which, in Figure l shows the chuck in longitudinal section, while Fig. 2 is a transverse section along the line ain Fig. 1. Fig. 3 is a section along the line c-fZ in Fig. l.

The drill-holder, 4, which is provided with a conical aperture, l, for the drill, has a longitudinal groove in which a loose part, 3, is placed in such a way that it forms a part of the outwardly cylindrical holder. Around the holder there is arranged a hollow cylinder, 5, between which and the holder there is arranged a roller-bearing or a ball-bearing, 6, which retains theloose part, 3, in its place.

In the roller-path there is made at a place in the cylinder, `5, a shallow slot, 7, .of somewhat greater breadth than the loose part, 3, so that when the cylinder, 5, is rotated in such a manner that the slot comes just opposite the loose part, as is shown in Figs. l and 2 in the drawing, the part, 3, can then move outward and thereby release the drill. A spring, 2, retains the cylinder, 5, in the position that is required for keeping the drill lined. At both ends of the cylinder the latter is provided with disks, 8 and 9, which keep the parts together.

In order to be ableto employ drills whose catch-pins have been broken off, the wall of the conical aperture is provided with pinholes for pins, 1l, on a loose part, 10, so that the latter can be attached to the said wall of the conical hole. By grinding the drill-:fastening so that the latter lits against the said loose part, drills which have been broken ott can, as was said above, also be used in the chuck. A

When the drill is to be released,"the hollow cylinder, 5, is rotated about one-quarter of a turn, after which the loose part, 3, can fall out and release the drill. As a result of the roller-bearing or the ball-bearing, the friction that arises on pressing the drill into the conical aperture is, to a great extent, nulliied, so that the cylinder, 5, can easily be rotated by breaking by hand while the drilling-machine is in motion and the drill can conveniently be changed without its being necessary to stop the drilling-machine. ln order to prevent the cylinder, 5, from being rotated too far it is provided with a catch device consisting of a pin, l2, firmly attached to the cylinder, which pin engages in a groove, 13, in the holder.

I claim.

l. In a drill-chuck the combination of a fixed part (4), a loose part (3) which enters into a longitudinal groove in the lined part, a ball-bearing (6) which surrounds the fixed and the loose parts and a cylinder (5) surrounding the ball-bearing and provided with a longitudinal slot (7), substantially as described.

2. In a drill-chuck the combination of a liXed part (4), a loose part (3) which enters into a longitudinal groove in the xed part, a roller-bearing (6) which` surrounds the fixed and the loose parts and a cylinder (5) surrounding the roller-bearing and provided with a longitudinal slot (7), substantially as described.

3. ln a drill-chuck the combination of a iixed part (4), a loose part (3) which enters into a longitudinal groove in the fixed part, a ball-bearing (6) which surrounds the Xed and the loose parts and a cylinder (5) surrounding the ball-bearing and provided with a longitudinal slot (7), a spring (2) fixed partly in the cylinder (5) and partly in the iXed part (4), and a pin (l2) fixed in the cylinder (5) and entering into a groove (13) in the fixed pait9 substantially as described.

d. ln a drill-chuck die combination oi e iixed part (il), a loose pziit (5) which eners into a longitudinal groove in Jche fixed part, o ollef-beaifing (6) which surrounds the iixed and the loose poils and :i cylinder (5) surrounding the roller-bearing and provided with a longitudinal sl'oi (Y), a spying (2) fixed partly in the eylindei1 (5) and partly in tlie fixed part (4)v and a pin (l2) fixed in die cylinder (5) and enteing into a gi'oove (18) in the ixed part, substantially as desoi'ibed..

o. ln a drill-Chuck 'the combination of o fixed part o loose part (3) which enteis into a longitudinal gioove in the fixed paire,

a, ball-beofing (6) Wliioli surrounds Jolie fixed memo? and the loose parte and aoylinder (5,) suiiounding the ball-beaiing and povided with a dill-cliuok the combination of a (3) which enters into e longitudinal groove in the xed peut, a Toller-bearing (6) which surrounds the fixed and 'the loose parts and L cylinder (5) .surrounding the rollerbearing and provided Y With a longitudinal slot (7), aloose part (l0) provided with pins (11)(entering into holes in the iiXed part (Il), substantially as described Nll GUSTF BERGLUND.

@Copies of this paen may be obizaned ioi five cents each, by addressing; the Commissioner of "Emeutes, 'ZIeeiingoe 'D il. 

